Looks pretty good David. You'll want to watch the braces and see if they do the job. They are make to push straight up on the platform to counteract the water force twisting up on the down pipe. You could look at putting a stainless square tube across the platform directly above the support holes inside the bends. Then run a bar up to that to support the pipe.

Yes they are attached. Mine are more triangulated.. It would break the bolts at the pipe before it's moving anywhere.I read a few post on fae's moving back with the mounts straight up. What you can't see is the drop of the outlet pipes running toward the fae & the exhaust pipe actually run inside of the outlets on the transom with stainless screws under the rubber hose couplings. It is also pinned at the elbows leaving only the down pipe to rotate if it hits something.

The picture makes it look offset, I'm not standing right behind the boat. I'm going to install the ones straight up, But leave the others there. I don't want someone to climb up using it as a step. My son can stand on the top of the FAE & It does not budge as I said the pipes run inside the outlets & are stainless screwed. The rubber boots are not holding it in place only sealing the tubes. But there's some ( 1/4") upward movement when you pull up on it(Hard). I have some aluminum bar stock to use under the bottom of the deck for mounts.